diff --git a/paragonik-backend/app/Models/Category.php b/paragonik-backend/app/Models/Category.php
new file mode 100644
index 0000000..ac18264
--- /dev/null
+++ b/paragonik-backend/app/Models/Category.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Category extends Model
+{
+    public function receipt_items()
+    {
+        return $this->belongsTo('App\Models\ReceiptItem');
+    }
+
+    public function services()
+    {
+        return $this->belongsToMany('App\Models\Service', 'categories_services');
+    }
+}
diff --git a/paragonik-backend/app/Models/Receipt.php b/paragonik-backend/app/Models/Receipt.php
new file mode 100644
index 0000000..d68ebcb
--- /dev/null
+++ b/paragonik-backend/app/Models/Receipt.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Receipt extends Model
+{
+    public function user()
+    {
+        return $this->belongsTo('App\User');
+    }
+
+    public function store()
+    {
+        return $this->belongsTo('App\User');
+    }
+
+    public function receipt_items()
+    {
+        return $this->hasMany('App\Models\ReceiptItem');
+    }
+}
diff --git a/paragonik-backend/app/Models/ReceiptItem.php b/paragonik-backend/app/Models/ReceiptItem.php
new file mode 100644
index 0000000..941d772
--- /dev/null
+++ b/paragonik-backend/app/Models/ReceiptItem.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class ReceiptItem extends Model
+{
+    protected $table = 'receipt_items';
+
+    public function receipts()
+    {
+        return $this->belongsTo('App\Models\Receipt');
+    }
+
+    public function categories()
+    {
+        return $this->hasMany('App\Models\Category');
+    }
+}
diff --git a/paragonik-backend/app/Models/Service.php b/paragonik-backend/app/Models/Service.php
new file mode 100644
index 0000000..7fad8fb
--- /dev/null
+++ b/paragonik-backend/app/Models/Service.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Service extends Model
+{
+    public function users()
+    {
+        return $this->belongsToMany('App\Models\Category', 'categories_services');
+    }
+}
diff --git a/paragonik-backend/app/Models/Store.php b/paragonik-backend/app/Models/Store.php
new file mode 100644
index 0000000..0aac03c
--- /dev/null
+++ b/paragonik-backend/app/Models/Store.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Store extends Model
+{
+    public function post()
+    {
+        return $this->hasMany('App\Models\Receipt');
+    }
+}